the elections for example in the states, tell us what you think. this is gmt from "bbc world news." i'm david eades. the headlines. america's presidential candidates prepare to take to the stage in denver in their first televised debate. 50 million viewers are expected to tune in. hamas government denies declarations of torture and arbitrary arrests in gaza. that's time where we bring you the business news now. aaron is here for that. some interesting figures worrying as we are used to hearing tesco going from strength-to-strength. >> we are talking about the largest chain in the u.k. out of every eight pounds one goes through a tesco till. that is because company today reported its first fall or drop in profits in nearly 20 years. the first half of this year $2.7 billion was made but down 11.5% from last year. why? we know tesco spent $1.5 billion in revamping. that's costly. but they are saying smaller supermarket chains are starting to eat into their market share and the big operations, big problems and tesco can no longer rely on overseas businesses to offset any shortages here.